COVID-19 vaccines.During a health crisis, the FDA can loosen its normal scientific standards to allow emergency use of experimental drugs, devices, vaccines and other medical products.
The first vaccines to get the provisional green light in the US are almost certain to be made available under this process, known as emergency use authorization.Instead of the usual requirement of “substantial evidence" of safety and effectiveness for approval, the FDA can allow products onto the market as long as their benefits are likely to outweigh their risks.